SQL Exercises is intended for acquiring good practical experience,
which is focused on data operation, namely on SQL DML. Certain exercises for beginners are provided on the site,
they are supplied with the necessary reference source on SQL syntax with a great number of examples.
Apart from them, 3 rating stages are suggested, they are aimed at testing of specialists and their certification.
The source is absolutely free of charge, and the certificate purchase has a voluntary basis.
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Exercises on usage of SELECT statement

Here you can practice in solving exercises on data retrieving (SELECT statement of SQL
language). The tasks of the first stage testing are accessible without registration
(the "Enter without login" button). However, for your decisions were kept in system,
the statistics of the solved problems was conducted, there was an opportunity of
participation in ratings and discussions, to be able to order the certificate,
registration and the authorized logon is required. More about certification.
On this page it is possible to carry out any SELECT statements addressed to the
learning databases. To switch off check of accuracy of the decision, click
"without check" checkbox. After solving all the tasks of the first stage, the
second stage of testing becomes accessible. Thus tasks of the second stage appear
one by one in the combo box of the task choice.